How did theodor schwann contribute to the cell theory

He established that the cell is the basic unit of all living things.

Explanation:

Theodor Schwann was an anatomist and physiologist who is best known for developing the cell doctrine that all living things are composed of cells. He established that the cell is the basic unit of all living things. He believed that cells are governed by scientific processes and rejected vitalism which invoked the presence of some special energy or vital spark that only living things possessed.

His classification of different cells is the foundation of modern histology.

Schwann discovered the enzyme pepsin and discovered glial cells in nerves – these are now known as Schwann cells. He also identified the role that microorganisms play in alcohol fermentation.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.